div+ajax 实现网页框架布局

核心代码：

function fnSuccMainBody(xhr){
	// main body
	document.getElementById("main").innerHTML = xhr.responseText;
	
	// sub : sub body
	if(document.getElementById("submain") != null)
		ShowComments();
}

function fnSuccSubMainBody(xhr){
	document.getElementById("submain").innerHTML = xhr.responseText;
}

function AjaxRequest(url, data, fnSucc)
{       
	var xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
        
	xhr.onreadystatechange = function(){
		AjaxCallBack(xhr, fnSucc);
	};
        
	xhr.open("post", url, true);
	xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded;');
	 
	xhr.send(data);
}

function AjaxCallBack(xhr, fnSucc)
{
	if(xhr.readyState == 4)
	{
		var s = xhr.status;
		if(s >= 200 && s < 300)
			fnSucc(xhr);
		else
			;
	}	
}

// 调用
function showMain()
{
	var url = xxx;
	var data = xxx;
	AjaxRequest(url, data, fnSuccMainBody);		
}

function showSubMain()
{
	var url = xxx;
	var data = xxx;
	AjaxRequest(url, data, fnSuccSubMainBody);			
}

参考：

div+ajax实现类似iframe功能

http://lz12366.iteye.com/blog/1137458

frameset和div常规布局的优缺点比较

http://blog.csdn.net/zhangxinrun/article/details/5677829